In quasars, the black hole is supermassive ( millions of solar masses ); in microquasars, the mass of the compact object is only a few solar masses.

There is ample evidence that the intense radiation emitted by certain kinds of astronomical objects is due to black holes ; for example, microquasars and active galactic nuclei result from the presence of stellar black holes and black holes of a much more massive type, respectively.

Noteworthy microquasars include SS 433, in which atomic emission lines are visible from both jets ; GRS 1915 + 105, with an especially high jet velocity ; the very bright Cygnus X-1 ; and the microquasar candidate LS I + 61 303, which has been discovered to emit VHE ( Very High Energy ) gamma rays.

For this reason, Cygnus X-1 is identified among a class of objects called microquasars ; an analog of the quasars, or quasi-stellar radio sources, now known to be distant active galactic nuclei.

However, all known microquasars produce large quantities of X-rays, whereas the object's X-ray flux is below the measurement threshold.

A famous example is SS433, whose well-observed jet has a velocity of 0. 23c, although other microquasars appear to have much higher ( but less well measured ) jet velocities.

Their strong gravity is thought to be responsible for the intense radiation emitted by certain types of astronomical objects ( such as active galactic nuclei or microquasars ).

Their strong gravity is thought to be responsible for the intense radiation emitted by certain types of astronomical objects ( such as active galactic nuclei or microquasars ).

radio galaxies, quasars and recently also in some galactic sources called microquasars.

These systems are often called microquasars.

where is the velocity of the ejected / accreted mass as seen in the object's rest frame.

This equation is derived by keeping track of both the momentum of the object as well as the momentum of the ejected / accreted mass.

In astrophysics, mass transfer is the process by which matter gravitationally bound to a body, usually a star, fills its Roche lobe and becomes gravitationally bound to a second body, usually a compact object ( white dwarf, neutron star or black hole ), and is eventually accreted onto it.

Furthermore, only five percent of the accreted mass is fused to power the outburst.

By this time the forming star has already accreted much of its mass: the total mass of the disk and remaining envelope does not exceed 10 – 20 % of the mass of the central YSO.

The mass of the disk around a classical T Tauri star is about 1 – 3 % of the stellar mass, and it is accreted at a rate of 10 < sup >- 7 </ sup > to 10 < sup >- 9 </ sup > solar masses per year.

Geodes also differ from " nodules " in that a nodule is a mass of mineral matter that has accreted around the nodule nucleous.

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When the Avalonia tectonic plate was accreted onto the Laurentian plate during the Acadian orogen, the land mass was pushed on top of the Laurentian plate creating a depressed area called a foreland basin or foredeep.

Some island arc remnants were emplaced on the Laurentian margin, and some were accreted during orogeny .< ref name =" corriveau "> Timing of these events is constrained by cross-cutting relations observed in the field as well as SHRIMP ( sensitive high-resolution ion microprobe ) and TIMS ( thermal ionization mass spectrometry ) uranium-lead dating.

It is probably an O or B type main sequence dwarf, which has accreted much of the original mass of the primary.

The accreted gas in this case comes from the molecular cloud out of which the star has formed rather than a companion star.

This disc is being accreted from material in the solar wind from Mira and could eventually form new planets.

The gravity of shepherd moons serves to maintain a sharply defined edge to the ring ; material that drifts closer to the shepherd moon's orbit is either deflected back into the body of the ring, ejected from the system, or accreted onto the moon itself.

Theia's iron core would have sunk into the young Earth's core, and most of Theia's mantle accreted onto the Earth's mantle, however, a significant portion of the mantle material from both Theia and the Earth would have been ejected into orbit around the Earth.

Proteus is probably not an original body that formed with Neptune ; it may have accreted later from the debris created when the largest Neptunian satellite Triton was captured.

Proteus, like the other inner satellites of Neptune, is unlikely to be an original body that formed with it, more probably having accreted from the wreak rubble that remained after Triton's capture.

Magma ascending from the Farallon Plate under the new continental margin burned their way upward through the newly accreted Insular Belt, injecting huge quantities of granite into older igneous rocks of the Insular Belt.

The rest might have been accreted from now defunct dwarf galaxies.

* Rocks-Minds in charge of planetoid-like structures, built / accreted, mostly from the earliest times of the Culture before it moved into space-built orbitals.

When hydrogen gas is accreted onto a white dwarf from a binary companion star, the hydrogen usually fuses to form helium.

As a result, chondrites coming from asteroids that did not accrete with their full complement of metal ( e. g., L, LL, and EL chondrites ) are depleted in all siderophile elements, whereas those that accreted too much metal ( e. g., CH, CB, and EH chondrites ) are enriched in these elements compared to the sun.

The star presently observed to be a giant star accreted carbon-rich material when it was still a main sequence star from its companion ( that is, the star that is now the white dwarf ) when the latter was still a classical carbon star.

Gas is accreted from the stellar companion and is channeled by the neutron star's magnetic field on to the magnetic poles producing two or more localized X-ray hot spots similar to the two auroral zones on the Earth but far hotter.

The accreted matter transfers angular momentum to ( or from ) the neutron star causing the spin rate to increase or decrease at rates that are often hundreds of times faster than the typical spin down rate in radio pulsars.

Some material may have accreted from volcanic island arcs which formed further out in the ocean and later collided with Gondwana as a result of plate tectonic movements.

* Accretion-powered pulsars ( accounting for most but not all X-ray pulsars ), where the gravitational potential energy of accreted matter is the power source ( producing X-rays that are observable from the Earth ).

A terrane in geology is short-hand term for a tectonostratigraphic terrane, which is a fragment of crustal material formed on, or broken off from, one tectonic plate and accreted or " sutured " to crust lying on another plate.

When the plate of which it was a part subducted under another plate, the terrane failed to subduct, detached from its transporting plate, and accreted onto the overriding plate.

Matter is being accreted from the star onto the neutron star, resulting in X-ray emission.

Avalonia islands gradually accreted onto the eastern margin of the Laurentia plate and created magmatic activity which can be found in scattered outcrop belts along parts of Newfoundland and much of the coastal region of New England from Connecticut to northern Maine.

Because of their elevated charcoal content and the common presence of pottery remains, it is now widely accepted that these soils accreted near living quarters as residues from food preparation, cooking fires, animal and fish bones, broken pottery, etc., accumulated.

Most of the iron core from the impacting body is predicted to have accreted to the core of the Earth.